<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgpu - light probe from cube camera</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="example.css">
	</head>

	<body>

		<div id="info">
			<a href="https://threejs.org/" target="_blank" rel="noopener" class="logo-link"></a>

			<div class="title-wrapper">
				<a href="https://threejs.org/" target="_blank" rel="noopener">three.js</a><span>Light Probe from Cube Camera</span>
			</div>

			<small>
				Light probes and environment lighting from cube camera.
			</small>
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.webgpu.js",
					"three/webgpu": "../build/three.webgpu.js",
					"three/tsl": "../build/three.tsl.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three/webgpu';

			import { Inspector } from 'three/addons/inspector/Inspector.js';

			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { LightProbeHelper } from 'three/addons/helpers/LightProbeHelperGPU.js';
			import { LightProbeGenerator } from 'three/addons/lights/LightProbeGenerator.js';

			let renderer, scene, camera, cubeCamera;

			let lightProbe;

			init();

			function init() {

				// renderer
				renderer = new THREE.WebGPURenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.inspector = new Inspector();
				document.body.appendChild( renderer.domElement );

				// scene
				scene = new THREE.Scene();

				// camera
				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 0, 0, 30 );

				const cubeRenderTarget = new THREE.WebGLCubeRenderTarget( 256 );

				cubeCamera = new THREE.CubeCamera( 1, 1000, cubeRenderTarget );

				// controls
				const controls = new OrbitControls( camera, renderer.domElement );
				controls.addEventListener( 'change', render );
				controls.minDistance = 10;
				controls.maxDistance = 50;
				controls.enablePan = false;

				// probe
				lightProbe = new THREE.LightProbe();
				scene.add( lightProbe );

				// envmap
				const genCubeUrls = function ( prefix, postfix ) {

					return [
						prefix + 'px' + postfix, prefix + 'nx' + postfix,
						prefix + 'py' + postfix, prefix + 'ny' + postfix,
						prefix + 'pz' + postfix, prefix + 'nz' + postfix
					];

				};

				const urls = genCubeUrls( 'textures/cube/pisa/', '.png' );

				new THREE.CubeTextureLoader().load( urls, async function ( cubeTexture ) {

					scene.background = cubeTexture;

					await renderer.init();

					cubeCamera.update( renderer, scene );

					const probe = await LightProbeGenerator.fromCubeRenderTarget( renderer, cubeRenderTarget );

					lightProbe.copy( probe );

					scene.add( new LightProbeHelper( lightProbe, 5 ) );

					render();

				} );

				// listener
				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				renderer.setSize( window.innerWidth, window.innerHeight );

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				render();

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>
